Use QLineEdit built-in ClearButton (Qt5 only)

src/gui/lineedit/src/lineedit.cpp

@@ -8,21 +8,28 @@
 ****************************************************************************/
 
 #include "lineedit.h"
-#include <QToolButton>
+#include <algorithm>
 #include <QStyle>
-#include <QtDebug>
+#include <QToolButton>
+#include <QResizeEvent>
 
 LineEdit::LineEdit(QWidget *parent)
   : QLineEdit(parent)
 {
-  searchButton = new QToolButton(this);
+  int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
+
   QPixmap pixmap1(":/lineeditimages/search.png");
+  searchButton = new QToolButton(this);
   searchButton->setIcon(QIcon(pixmap1));
   searchButton->setIconSize(pixmap1.size());
   searchButton->setCursor(Qt::ArrowCursor);
   searchButton->setStyleSheet("QToolButton { border: none; padding: 2px; }");
-  clearButton = new QToolButton(this);
+
+  int clearButtonSizeHintWidth = 0;
+  int clearButtonSizeHintHeight = 0;
+#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
   QPixmap pixmap2(":/lineeditimages/clear_left.png");
+  clearButton = new QToolButton(this);
   clearButton->setIcon(QIcon(pixmap2));
   clearButton->setIconSize(pixmap2.size());
   clearButton->setCursor(Qt::ArrowCursor);
@@ -31,25 +38,35 @@ LineEdit::LineEdit(QWidget *parent)
   clearButton->hide();
   connect(clearButton, SIGNAL(clicked()), this, SLOT(clear()));
   connect(this, SIGNAL(textChanged(const QString&)), this, SLOT(updateCloseButton(const QString&)));
-  int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
-  setStyleSheet(QString("QLineEdit { padding-right: %1px; padding-left: %2px; }").arg(clearButton->sizeHint().width() + frameWidth + 1).arg(clearButton->sizeHint().width() + frameWidth + 1));
-  QSize msz = minimumSizeHint();
-  setMinimumSize(qMax(msz.width(), clearButton->sizeHint().width() + searchButton->sizeHint().width() + frameWidth * 2 + 2),
-                 qMax(msz.height(), clearButton->sizeHint().height() + frameWidth * 2 + 2));
+
+  clearButtonSizeHintWidth = clearButton->sizeHint().width();
+  clearButtonSizeHintHeight = clearButton->sizeHint().height();
+  setStyleSheet(QString("QLineEdit { padding-left: %1px; padding-right: %2px; }").arg(searchButton->sizeHint().width()).arg(clearButtonSizeHintWidth));
+#else
+  setClearButtonEnabled(true);
+  setStyleSheet(QString("QLineEdit { padding-left: %1px; }").arg(searchButton->sizeHint().width()));  // padding between text and widget borders
+#endif
+
+  QSize msz = sizeHint();
+  setMinimumSize(qMax(msz.width(), searchButton->sizeHint().width() + clearButtonSizeHintWidth),
+                  std::max({ msz.height(), searchButton->sizeHint().height(), clearButtonSizeHintHeight }) + frameWidth * 2);
 }
 
-void LineEdit::resizeEvent(QResizeEvent *)
+void LineEdit::resizeEvent(QResizeEvent *e)
 {
-  QSize sz = searchButton->sizeHint();
   int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
-  searchButton->move(rect().left() + frameWidth, (rect().bottom() + 2 - sz.height())/2);
-  sz = clearButton->sizeHint();
-  clearButton->move(rect().right() - frameWidth - sz.width(),
-                    (rect().bottom() + 2 - sz.height())/2);
+
+  QSize sz = searchButton->sizeHint();
+  searchButton->move(frameWidth, (e->size().height() - sz.height()) / 2);
+#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+  QSize cz = clearButton->sizeHint();
+  clearButton->move((e->size().width() - frameWidth - cz.width()), (e->size().height() - sz.height()) / 2);
+#endif
 }
 
 void LineEdit::updateCloseButton(const QString& text)
 {
+#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
   clearButton->setVisible(!text.isEmpty());
+#endif
 }
-

src/gui/lineedit/src/lineedit.h

@@ -12,26 +12,26 @@
 
 #include <QLineEdit>
 
-QT_BEGIN_NAMESPACE
 class QToolButton;
-QT_END_NAMESPACE
 
 class LineEdit : public QLineEdit
 {
   Q_OBJECT
 
 public:
-  LineEdit(QWidget *parent = 0);
+  LineEdit(QWidget *parent);
 
 protected:
-  void resizeEvent(QResizeEvent *);
+  void resizeEvent(QResizeEvent *e);
 
 private slots:
   void updateCloseButton(const QString &text);
 
 private:
-  QToolButton *clearButton;
   QToolButton *searchButton;
+#if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
+  QToolButton *clearButton;
+#endif
 };
 
 #endif // LIENEDIT_H

src/searchengine/searchengine.cpp

@@ -64,7 +64,7 @@
 /*SEARCH ENGINE START*/
 SearchEngine::SearchEngine(MainWindow* parent)
     : QWidget(parent)
-    , search_pattern(new LineEdit)
+    , search_pattern(new LineEdit(this))
     , mp_mainWindow(parent)
 {
     setupUi(this);